| Season | 2021 |
|---|---|
| Dates | 10 April 2021 – 4 December 2021 |
| Champions | Malmö FF 25th Allsvenskan title 22nd Swedish title |
| Relegated | Halmstads BK Örebro SK Östersunds FK |
| Champions League | Malmö FF |
| Europa Conference League | AIK Djurgårdens IF |
| Matches played | 240 |
| Goals scored | 638 (2.66 per match) |
| Top goalscorer | Samuel Adegbenro (17 goals) |
| Biggest home win | Östersunds FK 5–0 Örebro SK (18 April 2021) BK Häcken 5–0 Östersunds FK (8 August 2021) BK Häcken 5–0 IFK Norrköping (18 October 2021) |
| Biggest away win | Degerfors IF 0–5 Malmö FF (17 July 2021) |
| Highest scoring | Hammarby IF 5–3 Kalmar FF (4 December 2021) |
| Longest winning run | 5 matches AIK[1] |
| Longest unbeaten run | 11 matches AIK |
| Longest winless run | 11 matches Mjällby AIF |
| Longest losing run | 5 matches Örebro SK Mjällby AIF Östersunds FK Degerfors IF |
| Highest attendance | 42,539 AIK 1–0 Djurgårdens IF (3 October 2021) |
| Average attendance | 1,977 |
← 2020 2022 → | |
The 2021 Allsvenskan was the 97th season since its establishment in 1924 of Sweden's top-level football league, Allsvenskan. A total of 16 teams participated. Malmö FF were the defending champions after winning the title in the previous season, and they defended the championship in the 30th and final round on 4 December 2021 and secured their 22nd Swedish championship title by playing a scoreless tie at home against Halmstads BK, resulting in Malmö FF winning the title on better goal difference than the runner-up (AIK). This was the first time the title was defended since 2017, and the third consecutive defense of the title that went to Malmö FF, having also defended the title in 2014.
The 2021 Allsvenskan season began on 10 April and ended on 4 December 2021 (not including play-off matches).